Design of catalytic carbon nanotube-based reactor for water denitration – The impact of active metal confinement

Sanja Panić, Á. Kukovecz, Goran Boskovic

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The catalytic reduction of nitrate to N2 represents the efficient water remediation technique in terms of the achieved nitrate depletion, but still with a main drawback – the production of ammonia as the undesired product. Therefore, efforts are undertaken to solve the problem, in terms of both reactor and catalyst design. Usage of internal cavities of carbon nanotubes (CNTs) may be a solution, both as a catalyst support and chemical nanoreactor. The aim of this work was to examine the activity and selectivity of Pd-Cu active phase located inside the carbon nanotubes – the confinement effect. Due to more accurate analysis of this effect, catalytic behavior of the metal nanoparticles deposited on the CNT exterior walls was also tested. Positioning of the active metal phase, i.e. exclusively inside or outside the CNTs, was promoted by previous CNTs cutting (via catalytic oxidation) and using solvents of different surface tension. The results of catalytic tests revealed the hindering effect of confined metal nanoparticles, while the externally deposited ones can be portrayed by superior performances in terms of both their activity and selectivity. The unexpected result was explained by a negative impact of confined particles due to their electron deficiency, as well as their size determining the second step of denitration reaction as a structure sensitive one.

Original languageEnglish
Pages (from-to)207-217
Number of pages11
JournalApplied Catalysis B: Environmental
Volume225
DOIs
Publication statusPublished - Jun 5 2018

Fingerprint

Carbon Nanotubes
Denitrification
Carbon nanotubes
Metals
Water
metal
Metal nanoparticles
Nitrates
water
catalyst
Nanoreactors
nitrate
Catalytic oxidation
surface tension
Remediation
Ammonia
Catalyst supports
positioning
Surface tension
cavity

Keywords

  • Carbon nanotube-based reactor
  • Carbon nanotubes cutting
  • Catalytic denitration
  • Confinement effect
  • Pd-Cu nanoparticles decoration

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

Cite this

Design of catalytic carbon nanotube-based reactor for water denitration – The impact of active metal confinement. / Panić, Sanja; Kukovecz, Á.; Boskovic, Goran.

In: Applied Catalysis B: Environmental, Vol. 225, 05.06.2018, p. 207-217.

Research output: Contribution to journalArticle

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